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  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta http-equiv="X-UA-Compatible" content="ie=edge" />
    <title>Column with Group Labels</title>

    <link href="../../assets/styles.css" rel="stylesheet" />

    <style>
      
        #chart {
      max-width: 650px;
      margin: 35px auto;
    }
      
    </style>

    <script>
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    </script>

    
    <script src="../../../dist/apexcharts.js"></script>
    

    <script>
      // Replace Math.random() with a pseudo-random number generator to get reproducible results in e2e tests
      // Based on https://gist.github.com/blixt/f17b47c62508be59987b
      var _seed = 42;
      Math.random = function() {
        _seed = _seed * 16807 % 2147483647;
        return (_seed - 1) / 2147483646;
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    </script>

    <script src="https://cdnjs.cloudflare.com/ajax/libs/dayjs/1.11.0/dayjs.min.js"></script>
  <script src="https://cdnjs.cloudflare.com/ajax/libs/dayjs/1.11.0/plugin/quarterOfYear.min.js"></script>
  <script>
    dayjs.extend(window.dayjs_plugin_quarterOfYear)
  </script>
  </head>

  <body>
     <div id="chart"></div>

    <script>
      
        var options = {
          series: [{
          name: "sales",
          data: [{
            x: '2019/01/01',
            y: 400
          }, {
            x: '2019/04/01',
            y: 430
          }, {
            x: '2019/07/01',
            y: 448
          }, {
            x: '2019/10/01',
            y: 470
          }, {
            x: '2020/01/01',
            y: 540
          }, {
            x: '2020/04/01',
            y: 580
          }, {
            x: '2020/07/01',
            y: 690
          }, {
            x: '2020/10/01',
            y: 690
          }]
        }],
          chart: {
          type: 'bar',
          height: 380
        },
        xaxis: {
          type: 'category',
          labels: {
            formatter: function(val) {
              return "Q" + dayjs(val).quarter()
            }
          },
          group: {
            style: {
              fontSize: '10px',
              fontWeight: 700
            },
            groups: [
              { title: '2019', cols: 4 },
              { title: '2020', cols: 4 }
            ]
          }
        },
        title: {
            text: 'Grouped Labels on the X-axis',
        },
        tooltip: {
          x: {
            formatter: function(val) {
              return "Q" + dayjs(val).quarter() + " " + dayjs(val).format("YYYY")
            }  
          }
        },
        };

        var chart = new ApexCharts(document.querySelector("#chart"), options);
        chart.render();
      
      
    </script>

    
  </body>
</html>
